On the standards track: Yes
Is Experimental: No
Is Deprecated: No
In Chrome version 1 on 2008-12-11 Removed from Chrome version 48 on 2016-01-20
Not in Chrome Android
Not in Edge
In Firefox version 3 on 2008-06-17
In Firefox for Android version 4 on 2011-03-29
In Internet Explorer version 8 on 2009-03-19
Not in Quest Browser
In Opera from the start
Not in Opera Android
Not in Safari
Not in Safari on iOS
Not in Samsung Internet
Not in WebView Android